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-rw-r--r--pkgs/development/python-modules/gym/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/python-modules/gym/default.nix b/pkgs/development/python-modules/gym/default.nix
index 44fbdc0401237..ad19991140bae 100644
--- a/pkgs/development/python-modules/gym/default.nix
+++ b/pkgs/development/python-modules/gym/default.nix
@@ -15,7 +15,7 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "openai";
     repo = pname;
-    rev = "${version}";
+    rev = "refs/tags/${version}";
     sha256 = "sha256-uJgm8l1SxIRC5PV6BIH/ht/1ucGT5UaUhkFMdusejgA=";
   };